a very silly question but I still do need help

Hi guys,just bought mme a bezel and strap for my GA110.I need to change one of my G shock so I cn make it look custom.I am having problems on what size the screw driver is.Is it a small phillips screw of a torx screw?I have both but cant seem to turn the darn screw.It is getting frustrating already...and I am excited to customize my watch.Need help please.

Try getting a Philips #000 screwdriver from a decent tool store, makes a hell of a difference having quality tools. Strap pins require a special tool to compress them, very simple piece of kit but so much easier than digging around with a knife blade or similar

^ what he said

Make sure you show us pics when you've done the mod.